Yes, I know this is very silly and all that but I've made it a few times now and it's pretty good. The problem with it is that it's kind of a pain to make. You have to have a food processor to rice your cauliflower, and that's a messy endeavor.
Except not if you live in California.
Because in California you can walk into any old grocery store and just buy a bag of "riced" cauliflower that is prepared in such a way that you can easily make cauliflower "mashed potatoes" or cauliflower "pizza crust." This is the joy of living in California.